Fire is the primary God in Vedas and the Agni is to be prepared manually using Banyan twigs/logs ,chanting Agni Suktham.
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The lighting of the Havan Agni with the churning (Manthan) of the special instrument made from a banyan tree, is considered extremely auspicious.
A participant said it required a lot of effort and that is why it is generally not used. It took them about 15 minutes to get it going.
Preparing Homa, Yagnya fire with Camphor as is being practiced now is incorrect.